Rotary Evolution replacement blades are made of black etched carbon steel. The set contains 9 blades and the screws that go with them, so a blade change is done in one go without hunting for fasteners.
The set replaces Yardforce AR BL003 and fits Yardforce Mowbest 805, Easy Mow 260B, Compact 300RBS and 400RiS, Classic 500B and 600B, SA650B, SA900B, NX60i, NX80i and NX100i.
Change all blades at the same time. A robotic mower runs with its blades balanced against each other, and a single new blade among worn ones makes the disc run unevenly.